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Swiss Journal of Geosciences
Fig. 8 | Swiss Journal of Geosciences

Fig. 8

From: Tectonometamorphic history of the Gruf complex (Central Alps): exhumation of a granulite–migmatite complex with the Bergell pluton

Fig. 8

Estimated metamorphic conditions (dark grey ellipse) of the Gruf migmatization. Solid lines experimentally determined reactions for the metapelitic system (references for reactions as in the text); dashed lines reaction curves for natural ultramafic bulk composition (Jenkins and Chernosky 1986; Evans and Guggenheim 1988); dotted line reaction calculated using the version 3.33 of THERMOCALC [Powell and Holland (2008); activities used in the calculation: biotite: x(bt) = 0.59; y(bi) = 0.54; Q(bi) = 0.15; cordierite: x(cd) = 0.39, h(cd) = 0.1; alkali feldspar: na(ksp) = 0.68; ca(ksp) = 0.11, abbreviations as defined by Powell and Holland (2008)]. For mineral abbreviations, see caption of Fig. 7

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